Chapter 1:
The Turtles drive around in April's van, looking for Splinter.
"Hey, was that what I think it was," asks a cop.
"After them," says his partner.
The police think April's vehicle was the one used in a recent robbery, so they chase after her. As luck would have it, the chase leads the cops to the actual robbers in their van... which looks exactly like April's vehicle! O'Neil and the turtles make their escape and head for her apartment to rest and make plans to find Splinter.
...
Meanwhile, Splinter takes a serious blow to the head while battling the Mousers in the sewer. Just as the rabid robots are about to make mouse meat out of the Sensei, they mysteriously march off in another direction. Splinter, dazed and nearly unconscious, takes this opportunity to escape by crawling into the tepid waters of the sewer system. The Master is discovered by two human guards, who take him to the TCRI laboratories. At the hi-tech facilities, Splinter discovers...
"By the souls of my ancestors-!"
To Be Continued
This is Non-cannon to the Ultimate Advanceverse. This is a sequel to Princesses of Power × All Grown Up!