Volume 1 features the five episodes from season 1, as well as 4 bonus episodes that are from season 10.
[*] would normally indicate a "Season Great", but all of them are, so the [*]s aren't relevant.
Turtle Tracks: 5/5 In the pilot episode, news reporter April O'Neil investigates a recent break-in supposedly by ninjas. The turtles find April and take her back to their sewer, where she finds out that they aren't freakshows. We learn how the turtles were turned to mutants, and how Splinter became a rat. Shredder prevents the turtles from reaching the Technodrome by flooding the skyscraper it's connected to.
Enter the Shredder: 5/5 Shredder captures Splinter in the Technodrome, and the turtles enter. The turtles have to face Shredder and his newly created mutants Bebop and Rocksteady.
A Thing About Rats: 5/5 A scientist, Baxter Stockman, invents a rat cathing robot called a Mouser, and Shredder has him make more. Shredder has the Mousers find the turtles, Splinter, and April O'Neil, but the turtles are there to attack them. While Michelangelo encounters Krang, Krang tells him where to find the master control, who only does so because he's mad at Shredder for not giving him a new body. Michelangelo destroys the building, and all the Mousers.
Hot-Rodding Teenagers From Dimension-X: 4.5/5 Things called Neutrionos come through Dimension-X and run into the turtles. After a misunderstanding, they all realize they are on the same page and want the same things. Eventually, the turtles lure the Rock Warriors into the Technodrome, but can't capture Shredder.
Shredder and Splintered: 5/5 Krang gets a new body, and grows huge in New York City. Splinter sacrifices his only chance at becoming human again to save the turtles from being turned back into normal turtles. Soon after, Donatello reverses the suction of Dimension-X, resulting in the Technodrome, Shredder, and Krang, all being sucked into Dimension-X.
Overall, this DVD is phenomenal. It has all 5 of the episodes in the first season, plus 4 bonus episodes - although they are pointless. The 4 bonus episodes are from the 10th season, and are completely random. It's hard to find out what's going on, and you'll find yourself very confused. Those four episodes are pretty much useless and pointless, but the first season was great. Short, but great. However, the DVD is straightforward. There are the five episodes, but no subtitles, commentary, chapter cuts in episodes, or even bonus features. Either way, TMNT: Volume 1 is absolutely great. It's cheap, but worth it. Definitely worth it.