Spell Resistance
The creature can avoid the effects of some spells and spelllike abilities that would directly affect it. To determine whether a spell or spell-like ability works against a creature with spell resistance, the caster must attempt a caster level check (1d20 + caster level). If the result equals or exceeds the creature’s spell resistance, the spell works normally, though the creature can still attempt any saving throws normally allowed. See page 265 of the Starfinder Core Rulebook for more information.
Format: SR 18.
Source
Alien Archive pg. 156