This article describes a multidisciplinary, asynchronous, 10-hour online training program for undergraduates enrolled in a mentored research apprentice program, addressing communication skills, knowledge of the research process, information literacy, and research ethics. A pretest-posttest survey was completed to assess students' perceived gains (n = 130) in knowledge and skills. A survey was also administered to faculty mentors (n = 50) to assess observations regarding students' gains. Results revealed significant perceived gains in all four content areas (p < 0.001) with no significant differences across disciplines. The findings suggest that the training content and format were successful in providing participants with foundational research knowledge and skills. Mentors' observations support the student findings and identify gains in discipline-specific skills. Implications for undergraduate research programs are discussed.