A small classified Starfleet vessel hidden aboard the USS Voyager-A in 2384, built for a mission through a temporal wormhole to find Captain Chakotay and launched by the Protostar cadets.
The Infinity is a compact Starfleet ship kept in a concealed bay of the USS Voyager-A. It appears in the second season of Star Trek: Prodigy, beginning with the two-part opener Into the Breach.
Admiral Janeway's real purpose in taking Voyager-A out is secret: to send the Infinity through the wormhole left by the Protostar's destruction, which leads to the future of the planet Solum, and bring back Chakotay. Dal and his friends, serving aboard as warrant officers in training, find the hidden ship while snooping.
They end up taking the Infinity through the wormhole themselves. They do find Chakotay, but their arrival disturbs the events that sent the Protostar into the past, a mistake the rest of the season is spent putting right.