The probe retains its role as the protoss worker unit in StarCraft II with no noticeable changes in function. However, as protoss shields regenerate faster than they did before, probes are more versatile scouts than they were in the original games.
All protoss commanders can use probes in Co-op Missions. Fenix can summon a hero probe Probius if he has all six champion AI on the field and builds a probe. Probius has the stats and abilities of a regular probe. Zeratul has access to a xel'naga variant of the probe named the xel'naga precursor.
The following section contains information from a previous version of StarCraft II which is no longer valid.
An area of effect ability which allows a group of probes to gather one more mineral per trip for a short time by enhancing their proton-cutters. Proton Charge only directly enhances their ability to harvest minerals. The duration doesn't stack when used multiple times, but casting it again will renew the duration.