This is the second crossover with another series, the first being in the third season of Mighty Morphin' with Masked Rider, both made by Saban.
The Ninja Turtles costumes are the costumes used in Ninja Turtles: The Next Mutation. They also include Venus de Milo who is in that series. Due to The Next Mutation being filmed in Canada while Power Rangers is filmed in California, the Turtles are portrayed by different suit and voice actors in this episode to those from their own show.
The Turtles exhibit the ability to reflect and bounce around an energy ball thrown by an enemy. This ability is usually for Venus de Milo, but not seen by the other male turtles in Next Mutation. Splinter displays such an ability in the anime OVA of Ninja Turtles, so this appearance implies that the male turtles were taught how to do this.
Fans have considered this episode (and, by extension, the final scene of the previous episode) to be non-canon, particularly due to the negative attitude towards The Next Mutation.